After being passed onto the National Records of Scotland, researchers believe the love-struck poet was Helen Smith Govan, who was born in Kinning Park, Glasgow on June 26, 1898.

Her message to the mystery soldier read: “I hope your kilt will fit you well, & in it you will look a swell. If married never mind. If single drop a line. Wish you bags of luck, & a speedy return back to Blighty.”

Records show that Helen Smith Govan is probably the youngest child of William Govan, a joiner, and his wife Jane Kinnon.

By the time of the First World War, she was living in a tenement flat in Ardgowan Street in Govan.

After leaving school, probably aged 14, it would have been natural for Helen to follow her sisters into the clothing trade. It is believed she wrote the note while working with Peter Wilson, kiltmakers of Bridge Street, Glasgow.

Helen died unmarried in Prestwick, where her family originated, in 1965, aged 67.

Researchers say the most likely connection to Helen's living relatives is through her nephews.

Her eldest sister Elizabeth, born in 1883, married housepainter John Vallance in 1905.

Their son William Vallance was living in the Paisley area at his death in 1971, leaving a brother John.

Dr Helen Paul said: "It is amazing that a note from WWI survived unseen for so many decades. It was written by an ordinary Glaswegian woman who probably knew that the war would reduce the number of men available in the marriage market. It seems as if Helen herself never married. I would love to know more about her life."

Free places have been made available to 1,000 members of the public who do not already have tickets for the special service at Edinburgh Castle, which takes place on August 10.

The multi-faith commemoration will be held before a congregation of almost 9,000 people and will consider the significant impact the Great War had on Scotland.